【題目】Betty is often seen the lonely old man with his housework.

A. to helpB. helpingC. helpsD. helped

【答案】A

【解析】

句意“貝蒂經(jīng)常被看到幫助老人做家務(wù)”。根據(jù)see sb doing“看到某人正在做;see sb do“看到某人做某事(全過(guò)程)”可知,本句話表示看到全過(guò)程,省略to,變成被動(dòng)時(shí),to要加上,即sb be seen to do,故選A。

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